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Originally Posted by tourist
Can I use NPT barbs and fit into BSP or vice versa?
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AFAIK you can use straight male fittings with tapered female ones. It's a "make do" kind of thing, though.
Even tapered fittings don't do a great job with high pressure unless you torque the fittings to the point that there's a bit of thread deformation.
As a side issue, fittings with asymmetrical thread profiles work much better. NASA's starting to use them, and, interestingly, they were a part of the whitworth (woex) thread standard from the 1870s or so (locomotive steam fittings). Re-invented or re-discovered in the standard...